Write a function which takes two string variables (not C strings) as inputs and compares them. If they are equal, the function should return 0. If the first string is less than the second string, return a negative number. If the first string is greater than the second string, return a positive number. You are not allowed to use the compare method of the string data type. You must use the comparison operators. Do not write a main function. Your function does not do any cin or cout. Make sure to properly format all your code.